I have a 16s 21 jewel Hampden New Railway,s.n. 3326935.It's all original as far as I know, and in very near mint condition.The case is obviously yellow gold filled, has a short pendant,s.b.&b.I've never seen a Dueber case marked this way, it just says " Dueber Exchange",and a ser.number.No karat or gold filled marking.Has anyone else seen one marked that way? I have no way to post a picture.Thanks... Ted Brown